Without commenting on anything else, I have encountered one use-case where it would be nice to be able to “call” an instance. And that is, while modeling some mathematics, I made a DifferentiableFunction type which stores a function and optionally a reference to another DifferentiableFunction (its derivative).
I used the subscript notation for “calling” these DifferentiableFunctions, because that’s what we have available, but it would certainly be nice to use parentheses rather than square brackets. Nevin
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